Fusion protein See F protein

Fv1 gene A murine gene that restricts infection by N-tropic or B-tropic murine leukemia viruses at a stage after entry into the cell. N-tropic viruses infect NIH 3T3 cells, B-tropic viruses infect BALB/c cells, and NB-tropic viruses infect both types of cell. The Fv1 gene is derived from an endogenous retrovirus unrelated

Fvl gene

to Murine leukemia virus. The viral determinants for N- and B-tropism are present in the capsid protein at amino-acid position 110, where an arginine specifies N-tropism and a glutamate B-tropism.

FV3 virus See Frog virus 3.

fyn An oncogene, related to src and belonging to the non-receptor tyrosine kinase family which is expressed in brain cells. It was originally cloned from an SV40-transformed human fibroblast library, and has not been found in any naturally occurring retrovirus.

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